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how do you know when the auxillary battery needs to be replaced?

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Old Nov 1, 2019 | 07:36 AM
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From: delaware
335i e90
how do you know when the auxillary battery needs to be replaced?

just a new guy question. picking up my car on Saturday. also is there a how to trans service post ? thanks
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Old Nov 1, 2019 | 09:49 AM
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From: MD
S 63 Coupe, GLS 63
When the warning comes on. They generally last about 4 years in this climate.

Transmission service requires a few special tools to pump fluid back into transmission as there is no dipstick or fill tube. I'd leave that to a pro to avoid any issues
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Old Nov 1, 2019 | 11:05 AM
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E63 SL55 996TT C5Z06
Originally Posted by sabredog
just a new guy question. picking up my car on Saturday. also is there a how to trans service post ? thanks
you can also tell the aux/trunk battery is low or dead when your car will not automatically turn off at a stop when in C / ECO mode..... i never use ECO but dealer said the battery was shot after 3 years on my 2015 and they replaced it under warranty a couple years ago.
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Old Nov 1, 2019 | 11:19 AM
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My warning light started last week. Brake Hold feature will not work either. Dealer said cruise control also not work. My Aux Battery, part number 000-982-96-08, replaced 2 days ago and they call it "STARTER BATTERY":

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Old Nov 1, 2019 | 11:21 AM
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From: delaware
335i e90
thank you.
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Old Nov 1, 2019 | 11:59 AM
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From: delaware
335i e90
how much is the trans service for these cars at a merc dealer on the east coast? anyone get theirs serviced lately?
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Old Apr 14, 2022 | 11:57 AM
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E63 SL55 996TT C5Z06
Originally Posted by E55 KEV
My warning light started last week. Brake Hold feature will not work either. Dealer said cruise control also not work. My Aux Battery, part number 000-982-96-08, replaced 2 days ago and they call it "STARTER BATTERY":


I have a 2015 E63 and seems my trunk auxiliary battery dies every 2-3 years and I just saw that FCP sells the MB OEM replacement with same part number ($135 or about 25 bucks higher than MB wholesaler) with their lifetime warranty so next time this dies in 2-3 years it will be a free replacement.... thought I would share as I am sure every w212/e63 owner is out of warranty by now and gonna need one of these sooner or later.

https://www.fcpeuro.com/products/mer...mer-0009829308
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